Agreed. For the vast majority of cases, a Lambda function is easier to ship and maintain, and most likely dramatically cheaper. I really only think the value of using Fargate kicks in compared to Lambda at around 5M+ invocations/month. YMMV based on workflow and workload.
You are comparing only the costs of running them, what about the cost of developers who build/debug/troubleshoot the container. As someone who is running both on Lambda and Fragate it's way harder to make things tick on Fargate
